Portion of a keyboard



FIG. 1 is a front perspective view of a keyboard showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a front perspective view identical to FIG. 1 identifying the region depicted in FIG. 4; and,

FIG. 4 is an enlarged view of the identified region labeled 4, of FIG. 3 depicting the relative appearance between the bars and the body of the keyboard.

The broken line showing of the remainder of the keyboard is for illustrative purposes only and forms no part of the claimed design. The uneven broken line identifier circle labeled 4 in FIG. 3 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a keyboard, as shown and described. 